Updated Air Freight Share Properties logic:

- Modified V4 migration to calculate `AIR_SHARE` as `0.03` for countries with `SAFETY_STOCK` value of 55, otherwise `0`.
- Refactored SQL to use `CASE` expression and JOIN for safety stock lookup within property set constraints.

src/main/resources/db/migration/V4__Country.sql

@@ -581,7 +581,7 @@ SELECT
 FROM `country` c, `country_property_type` cpt
 WHERE cpt.external_mapping_id = 'SAFETY_STOCK';
 
--- Air Freight Share Properties (all countries have 0%)
+-- Air Freight Share Properties (0.03 for countries with safety stock 55, otherwise 0%)
 INSERT INTO `country_property`
 (`country_id`, `country_property_type_id`, `property_set_id`, `property_value`)
 SELECT
@@ -593,8 +593,26 @@ SELECT
        AND (ps.end_date IS NULL OR ps.end_date > NOW())
      ORDER BY ps.start_date DESC
      LIMIT 1),
-    '0'
+    CASE
-FROM `country` c, `country_property_type` cpt
+        WHEN cp_safety.property_value = '55' THEN '0.03'
+        ELSE '0'
+        END
+FROM `country` c
+         CROSS JOIN `country_property_type` cpt
+         LEFT JOIN `country_property` cp_safety
+                   ON cp_safety.country_id = c.id
+                       AND cp_safety.country_property_type_id = (
+                           SELECT id FROM `country_property_type`
+                           WHERE external_mapping_id = 'SAFETY_STOCK'
+                       )
+                       AND cp_safety.property_set_id = (
+                           SELECT ps.id FROM `property_set` ps
+                           WHERE ps.state = 'VALID'
+                             AND ps.start_date <= NOW()
+                             AND (ps.end_date IS NULL OR ps.end_date > NOW())
+                           ORDER BY ps.start_date DESC
+                           LIMIT 1
+                       )
 WHERE cpt.external_mapping_id = 'AIR_SHARE';
 
 -- Wage Factor Properties (only for countries with defined values)